i don't test.
I dont install 9v battery boxes internally in my guitars.
hate em. as a matter of fact i own only one tuner (that stays home)
that takes a 9v battery.so when my batteries (AA)in my wireless unit
go dead it's about 30-45 seconds to change them out.
yes i wait till they die during a gig. always keep
some close by. everything else i have either runs off phantom or
120v. pedals are all pugged in . no batteries in them.
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